68947951 has 4 divisors (see below), whose sum is σ = 71945712. Its totient is φ = 65950192.

The previous prime is 68947913. The next prime is 68947969. The reversal of 68947951 is 15974986.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-68947951 is a prime.

It is a Smith number, since the sum of its digits (49) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 68947895 and 68947904.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (68947051) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1498846 + ... + 1498891.

It is an arithmetic number, because the mean of its divisors is an integer number (17986428).

Almost surely, 2^68947951 is an apocalyptic number.

68947951 is a deficient number, since it is larger than the sum of its proper divisors (2997761).

68947951 is a wasteful number, since it uses less digits than its factorization.

68947951 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2997760.

The product of its digits is 544320, while the sum is 49.

The square root of 68947951 is about 8303.4902902334. The cubic root of 68947951 is about 410.0534354308.

The spelling of 68947951 in words is "sixty-eight million, nine hundred forty-seven thousand, nine hundred fifty-one".